bangkok_geo = sub_district_geojson #'bangkok_sub_district.geojson' # geojson file

# create a plain province map
bangkok_map = folium.Map(location=[latitude, longitude], zoom_start=10)

#use different map tiles (OpenStreetMap, CartoDB, Stamen, Mapbox...) 
folium.TileLayer('CartoDB positron',name="Light Map",control=False).add_to(bangkok_map)

# generate choropleth map using the population of each district YlOrRd
bangkok_map.choropleth(    
    geo_data=bangkok_geo,
    data=df_province,
    columns=['sub_district_id','pop_density'],
    key_on='feature.properties.sub_district_id',
    fill_color='YlGnBu', 
    fill_opacity=0.7, 
    line_opacity=0.2,
    legend_name='people per square meter of each sub-district'
)

/usr/local/lib/python3.7/dist-packages/folium/folium.py:426: FutureWarning: The choropleth  method has been deprecated. Instead use the new Choropleth class, which has the same arguments. See the example notebook 'GeoJSON_and_choropleth' for how to do this.
  FutureWarning

style_function = lambda x: {'fillColor': '#ffffff', 
                            'color':'#000000', 
                            'fillOpacity': 0.1, 
                            'weight': 0.1}
highlight_function = lambda x: {'fillColor': '#000000', 
                                'color':'#000000', 
                                'fillOpacity': 0.50, 
                                'weight': 0.1}
NIL = folium.features.GeoJson(
    sub_district_geojson,
    style_function=style_function, 
    control=False,
    highlight_function=highlight_function, 
    tooltip=folium.features.GeoJsonTooltip(
        fields=['sub_district_eng','pop_density','rest_density'],
        aliases=['Sub-district name: ','People per square meter : ','Restaurant per square meter : '],
        style=("background-color: white; color: #333333; font-family: arial; font-size: 12px; padding: 10px;") 
    )
)
bangkok_map.add_child(NIL)
bangkok_map.keep_in_front(NIL)
folium.LayerControl().add_to(bangkok_map)
bangkok_map